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$arr = array(1,2,3);
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$arr = array(1,2,3);  
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setcookie("a[2]", $arr[2]); 
$arr = array(1,2,3);
setcookie("a[0]", $arr[0]);
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/**
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* @author Administrator
* @package defaultPackage
*/
class MySqlDB{
private $_db;
private static $_instance;
private function __construct(&$db_type){
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PHP

<?php
// open database connection
@ $db = new mysqli($host, $user, $password, $database_name);
if (mysql_connect_error())
{
echo '';
exit;
}
// query
$result = $db->query($sql);
$num_results = $db->num_rows;
// data
$row = $result->fetch_assoc(); // row is array, $row['id' ......
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